Error in return type for most 'autorange' properties in nidcpower library

Description of issue

In the code documentation, most of the "autorange"-related parameter are described as bool, which is wrong.
The correct type is int.

Steps to reproduce issue

``` python
import pytest

import nidcpower

@pytest.fixture
def smu() -> nidcpower.Session:
    return nidcpower.Session(
        resource_name="PXI1Slot2",
        channels=None,
        reset=True,
        options={'range_check': True,
                 'simulate': True,
                 'driver_setup': {'Model': '4163', 'BoardType': 'PXIe'}},
        independent_channels=True)

def test_wrong_type(smu):

    assert isinstance(smu.autorange, bool)

def test_correct_type(smu):

    assert isinstance(smu.autorange, int)
```

1. Run pytest on the above script.
2. The first test fails because an AssertiorError is raised.
3. The second test passes.

Start with the nidcpower API documentation linked in the issue and inspect the autorange-related parameters, then run the provided pytest reproduction against a simulated nidcpower.Session. Done means the affected autorange properties are documented with the correct int return type and the reproduction still passes.